Ключевые слова: ancient, architecture, asia, blue, brick, building, chimney, city, cultural, culture, detail, east, empire, erzurum, famous, historic, historical, history, islam, islamic, islamic arts, landmark, madrasa, madrassah, masjid, minaret, monument, mosaic, mosque, museum, muslim, old, oltu castle, ottoman, religion, ruby, school, seljuk, sightseeing, sky, stone, structure, tourism, tower, town, travel, turkey, turkish, unesco world heritage, visiting,